Pneumatic lift device for dual flow valve

Abstract

Positive adjustable flow is provided for a dual flow valve for paint dispensing or the like utilizing a sliding piston and a lost motion device in combination with an adjustable stop and wherein operating lift is provided by a single pressure source alternatively applied to a plurality of operating pistons.

What is claimed is: 
     
       1. A lift device for a dual flow valve comprising: a reciprocating flow control stem operatively engaged in one direction by a first piston reciprocating in a cylinder between defined limits of a forward stop and a rearward stop;   a second piston operatively connected to said flow control stem and reciprocating in a second cylinder between defined limits of a forward position and a rearward position;   a movable stop for adjusting said rearward position; and   a lost motion means operable by said flow control stem to accumulate reciprocation of said flow control stem imparted in said one direction by reciprocation of said first piston.   
     
     
       2. A lift device for dual flow valve according to claim 1 wherein: said movable stop and thus said rearward position is externally adjustable.   
     
     
       3. A lift device for dual flow valve according to claim 1 wherein: said first piston and said second piston are pneumatically deployed.   
     
     
       4. A lift device for dual flow valve according to claim 1 wherein: said dual flow valve is a paint dispensing valve.   
     
     
       5. A lift device for dual flow valve according to claim 1 wherein: said dual flow valve is an ink dispensing valve.   
     
     
       6. A lift device for dual flow valve according to claim 1, wherein: said lost motion means is for accumulating a difference in motion for deployment of a first and second orifice dispensing means.   
     
     
       7. A lift device for dual flow valve according to claim 6 wherein: said lost motion means is deployed between a stem connected to said second piston and a high flow orifice.   
     
     
       8. A lift device for dual flow valve according to claim 6 wherein: said stem directly operates a low flow orifice.   
     
     
       9. A lift device for a dual flow valve for dispensing paint, comprising: a reciprocating flow control stem operatively engaged in one direction by a first piston reciprocating in a cylinder between defined limits of a forward stop and a rearward stop;   a second piston operatively connected to said flow control stem and reciprocating in a second cylinder between defined limits of a forward position and a rearward position;   a movable stop for adjusting said rearward position; and   a lost motion means operable by said flow control stem to accumulate reciprocation of said flow control stem imparted in said one direction by reciprocation of said first piston.